Protective bumper



FIG. 1 is an isometric view of a protective bumper showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is an elevational view of the left or right side of FIG. 2, shown in an upended position;

FIG. 4 is an elevational view of the front or rear side of FIG. 2; and,

FIG. 5 is a bottom view thereof.

The partial stippling shown in FIG. 5 is understood to continue throughout the bottom surface of the bumper. 

The ornamental design for a protective bumper, as shown and described. 